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© 2020 Carrier
OPERATION
The HESI igniter is a Class 3 ignition source and is only in service during an ignition time trial dura-
tion. The HESI can operate during ignition and during oil gun shutdown and purge. Depending on the
application, the spark rod can be set in a fixed position or attached to a retraction assembly to move
it out of firing position. The spark rod should be fitted with the retraction assembly whenever the
HESI spark rod tip will be exposed to continuous temperatures above 149° C (300° F).
The burner management system provides the control signal that energizes the HESI during the ignition
time trial period. The power unit transforms the signal into short 12-joule discharges at the rate of three
sparks per second. The cable assembly transmits these discharges to the spark rod assembly.
TROUBLESHOOTING
If the HESI assembly malfunctions, ensure that the procedures described in the Commissioning Sec-
tion have been performed successfully. If problems persist, refer to Table 1 for troubleshooting infor-
mation.
Table 1:
Troubleshooting
SYMPTOM
PROBABLE CAUSE
REMEDY
Ceramic spark gap or spark
1. Input voltage low.
1. Provide correct voltage.
gap tube not flashing.
2. Power pack failure.
2. Replace power pack.
Ceramic spark gap or spark
1. Spark tip fouled and shorting
1. Replace tip assembly and
gap tube weak or erratic.
2. Tip insulator cracked or
adjust tip to gun setting as
damaged.
specified in drawing.
3. High tension cable inside rod
2. Replace tip assembly and
broken or insulation damaged.
adjust tip to gun setting as
specified in drawing.
3. Replace cable assembly.
Adjust tip to gun settings on
specified drawing.
WARNING: Hazardous voltage is present and serious injury to personnel can occur. Before opening
the power pack’s hinged cover, disconnect the electrical supply from the box. Allow at least 2 minutes
for the capacitor to discharge. Exercise extreme care when the power pack cover is open.
MAINTENANCE
Fireye recommends performing the following preventive maintenance every six
months.
SPARK TIP INSPECTION AND MAINTENANCE
Remove the spark rod from the guide tube and inspect the spark tip for damage due to overheating,
excessive use, and mishandling of equipment. A concave shape of the spark tip end represents normal
wear. If the semiconductor material is chipped, cracked, or eroded, replace the spark tip. If the inner
electrode, tip center, or tube shows deterioration, wear, or erosion, also replace the spark tip. When
replacing the spark tip, observe the following steps:
1.
Disconnect all electric power from the power unit and ensure that all residual voltage is dissi-
pated. (See Safety section.)
2.
Remove and replace tip using 1/2 inch wrench flats.
